CN1135717C - Receiver apparatus, and associated method, for receiving receive signal transmitted upon channel susceptible to interference - Google Patents

Receiver apparatus, and associated method, for receiving receive signal transmitted upon channel susceptible to interference Download PDF

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Publication number
CN1135717C
CN1135717C CNB988029448A CN98802944A CN1135717C CN 1135717 C CN1135717 C CN 1135717C CN B988029448 A CNB988029448 A CN B988029448A CN 98802944 A CN98802944 A CN 98802944A CN 1135717 C CN1135717 C CN 1135717C
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channel
signal component
interference
training sequence
needs
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CN1249864A (en
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��J���ƶ���
J·斯科尔德
M·赫克
»
N·爱德华松
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03305—Joint sequence estimation and interference removal

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

Apparatus (92), and an associated method (200), for estimating an interfering-signal component portion of a receive signal received at a receiver (76). The training sequence associated with the interfering-signal component portion is determined (94), even without prior knowledge of the training sequence associated with such interfering-signal component portion. Once the training sequence of the interfering-signal component portion is determined, the receive signal is selectively (108, 136), jointly detected utilizing a joint detector (118), the interfering-signal component portion of the receive signal is better able thereby to be canceled or otherwise suppressed.

Description

Receiver apparatus and relevant method
Technical field
The present invention relates generally to digital receiver, can operate being received in the received signal that transmits on the channel such as the common-channel interference sensitivity disturbing.More specifically, the present invention relates to be used to discern the interference signal component and the device and relevant method that are used for selectively suppressing the outer interference signal component part of this received signal of the signal that receives by this receiver.
Background technology
Even under the situation of the training sequence of not knowing in advance to be correlated with, discern this interference signal component part and form this interference signal component part partly.At first analyze this received signal so that the training sequence of identification and interference signal component part correlation.And, determine in the mode that needs signal component of the best of recovering this received signal.Can select: for example by jointly detecting interference signal component part with the signal component of these needs, so that recover the signal component that needs of this received signal, thereby suppress this interference signal component part, the perhaps signal component of the needs by only detecting this received signal is recovered the signal component of these needs.
When implementing in cellular communication system, the operation of the embodiment of the invention is convenient to better suppress common-channel interference.Because preferably can suppress common-channel interference, the channel that defines in cellular communication system can be reused in more effective mode, thereby increases power system capacity.For example, can reduce the cell quantity that forms cell clusters figure.
Utilize digital communication technology transmission information between dispatching station and receiving station little by little to catch in recent years.Radio communications system such as cellular communication system is the example of communication system, and they little by little are configured and utilize digital communication technology.
The communication channel of form is according to " bandwidth " definition of the part of the electromagnetic spectrum of distributing to this system between the transmission of radio communications system and receiving station.Define this channel according to the carrier frequency " carrier wave " in this distribution bandwidth at least in part.It is normally limited to distribute to radio communications system and available bandwidth.And the message capacity of the bandwidth constraints radio communications system by distributing to this system wherein.
In the multi-user radio electrical communication system, such as cellular communication system, because bandwidth constraints, the message capacity restriction forbids that sometimes other user utilizes this communication system.By more effectively utilizing the bandwidth of distributing to this communication system, the message capacity of this system can increase.
When channel forms between dispatching station and the receiving station link,, then distribute to the bandwidth of radio communications system and can more effectively utilize if digital communication technology is used to transmit the information that comprises signal of communication.
When utilizing digital communication technology to form signal of communication, utilize modulation technique such as the QPSK (Quadrature Phase Shift Keying) that selects or GMSK (Gauss's minimum value offset keying) sometimes technology is with the information signal digitlization and be modulated on the carrier wave.Sometimes alternatively utilize other modulation technique.Because this information signal is digitized, the pulse train that can disperse transmits signal of communication from wherein forming by dispatching station on communication channel.When transmitting signal of communication with discrete pulse train, this pulse train is linked at together in this receiving station.
Because signal of communication can transmit with discrete pulse train, allow the time division multiplexing of carrier wave.The two or more channels of definable on single carrier wave.
In the cellular communication system of at least one type, the system that constitutes according to the operating technology standard of global system for mobile communications utilizes digital communication technology.The bandwidth of distributing to the carrier wave of this communication system is divided into eight time slots.Eight road time division multiplexings are provided in such communication system, and the pulse train of signal of communication part transmits between dispatching station and receiving station on a this time slot of selecting.Carrier wave/time slot is combined to form this communication channel, transmits signal of communication thereon.
The standard agreement that proposes in GSM operating technology standard is defined in the structure of the normal burst of transmitting during the time slot of this gsm system definition.The signal of communication part that to transmit during the time slot of this gsm system definition is divided into a data field and training sequence field at least.A series of bits that this learning sequence field is known by this receiving station are formed.It is to allow this channel of this receiver equalization that the transmission known bits is given the purpose of this receiver.Generally, this distorted signals when this signal is propagated by radio medium, this equilibrium allows this receiver to estimate this channel impulse response, and promptly how this distortion influences this signal during it is transferred to this receiver.
Utilize such training sequence bit to be convenient to detect the content of the information of the data field that transmits with the learning sequence field in receiving station.
The geographic area cell everywhere that the analogue technique of cellular communication system utilization routine also utilizes the digital communication technology definition to be centered on by cellular communication system.The set of cell constitutes cell clusters.In each cell clusters, utilize total available bandwidth of distributing to this communication system.In continuous cell clusters, reuse the bandwidth of distribution.By having increased effectively by in each cell clusters, reusing this channel according to the message capacity of the restricted number of the channel of the definitions of bandwidth of distributing.
Sometimes reusing relevant problem with bandwidth is common-channel interference.When side by side transmitting signal of communication on the same communication channel in different mesh, this signal that transmits simultaneously is interfering with each other sometimes; This interference is called common-channel interference.Common-channel interference makes in the detection of the signal of the needs of receiving station's reception more difficult.If the level of common-channel interference is significant, the quality of this input may be unsuitable.
Reception utilizes the receiving station of the signal of communication that digital communication technology produces to comprise equalizer sometimes, so that the input of the information content of the signal of communication that receives in this receiving station.Generally, form the training sequence of a signal of communication part, so that the detection of the information content that needs signal that receives in this receiving station by this equalizer utilization.
When the received signal that receives in this receiving station when the two constitutes by the signal component of needs and interference signal component, can constitute an equalizer so as jointly to detect the signal component that needs and this interference signal component the two.Yet, in this equalizer, must know usually with signal component and the two relevant training sequence of interference signal component of needs.Though general this receiving station of the training sequence relevant with the signal component of needs knows, with the training sequence of the interference signal component part correlation of the interference signal component of formation at least a portion be unnecessary, this receiving station is ignorant usually.Do not know the training sequence of this interference signal component part, such interference signal component part of received signal generally can not suitably be detected and suppress in existing receiving station.
Permission receiving station determines that better a mode in the interference signal component part of the received signal of receiving station's reception will be favourable.By better detection interference signal component part, can better realize inhibition to such interference signal component part.Therefore, bandwidth is reused and can more effectively be carried out, and the result increases the message capacity of this communication system.
Summary of the invention
According to this background information of relevant digital receiver, carried out important improvement of the present invention.
The present invention advantageously provides the device and relevant method of the interference signal component part that is used to discern received signal, bestly suppresses in the detector of receiving station.In case discerned, selectively interference signal component partly suppressed outside this received signal.If such inhibition is convenient to detect the signal component part of the needs of this received signal, then suppressed the interference signal component part.
One or more interference signal component part is estimated in the operation of the embodiment of the invention, and does not require the training sequence with one or more interference signal component part correlation of knowing in advance.At first analyze received signal so that training sequence definite and one or more interference signal component part correlation.
Thereafter, the mode of the signal component of the needs of selection detection received signal.By jointly detecting the signal component of this interference signal component part together with these needs, perhaps the signal component of the needs by only detecting this received signal detects the signal component of these needs.
In one aspect of the invention, in cellular communication system implement device and method so that the detection of the signal component of the needs that receive in receiving station.When down link signal sent it to, this receiving station was made up of a portable terminal.And when uplink signal sent it to, this receiving station was made up of the radio base station of the network infrastructure of this cellular communication system.
By identification being provided, detecting and suppressing possibly the ability of this interference signal component part, even do not know relative training sequence in advance, this receiving station can rebuild the information content of the signal component that needs sometimes better.
Be convenient to better suppress common-channel interference by the operation of the embodiment of the invention.Because improvedly like this can suppress such interference, the channel that defines in cellular communication system can be reused in more effective mode, and therefore making increases the message capacity of this system.
Of the present invention other aspect in, the signal component of the needs of received signal and interference signal component part are jointly detected.Except an interference signal component part or more than one interference signal component part, for the common channel estimating of the calculated signals of needs.Calculate the value of residual interference for each.The value of residual interference is the indication of residual interference after detecting.The interference signal component that can suppress most effectively partly is the part that demonstrates the minimum estimation of residual interference.The most effective inhibition for example is to allow maximization this detection, that need the quality of data.Such interference signal component is partly suppressed outside this received signal.And, also carry out receiver operation thereafter according to the residual signal part.
Of the present invention other aspect in, channel estimating also only is made of the signal component of needs and from wherein calculating the value of residual interference.This calculated value and residual interference value for the minimum value of common channel estimation calculation are compared.If lower than the value of the residual interference of this individual channel detector calculating of response, then utilize common detector from the residual interference of wherein calculating.And, if it is littler than the residual interference value that this common detector of response calculates to respond the residual interference value of this individual channel detector generation, then replaces and utilize this individual channel detector.Therefore, determine to suppress most effectively, with the training sequence of the interference signal component part correlation of received signal, and utilize the signal that produces by common detector or individual channel detector.In a similar fashion, can also suppress more than one interference signal component part.
Of the present invention other again aspect in, in the radio receiver that receives received signal, be exercisable device and relevant method.This received signal is made up of the signal component and the interference signal component of needs.This interference signal component partly is made up of at least one interference signal component.The signal component of these needs has relative first training sequence.And this at least one interference signal component partly has relative at least one second training sequence.First and at least the second training sequence is selected from one group of training sequence respectively.First training sequence is a known value of this receiver when this receiver received signal at least.These apparatus and method are determined the value of this at least the second training sequence.The channel estimator that connects is received in the indication of the received signal of this receiver reception at least.Channel estimator produces the channel estimating group, and wherein the channel estimating of each group represents that received signal sends the characteristic of the estimation channel on the channel of this receiver to.The channel estimating of each group comprises the estimation of the channel that transmits the interference signal component part.This interference signal component part is relevant with the training sequence of training sequence group.Connect the residual interference estimator so that receive the indication of this estimation that forms by this channel estimator.This residual interference estimator produces the value of the residual interference of being estimated by this residual interference estimator.Selector is selected one group of channel estimating by channel estimator estimated channel group, and it demonstrates the residual interference value of desired value.The value that this training sequence relevant with the channel estimating group of being selected by this selector or a plurality of sequence are confirmed as this at least the second training sequence.
Of the present invention other aspect in, except one or more interference signal component part, also detect the signal component of the needs of received signal.For example in estimator, at first discern this interference signal component part by the training sequence of discerning this interference signal component part.This estimator also produces the mass measurement of this received signal.The quality of the signal component that this mass measurement reflection for example needs after detecting the residual interference measurement.For the signal component of needs and each combination of partly estimating for the possible interference signal component that the dose known amounts that detects is disturbed, determine mass measurement.Interference detector selects to detect the combination of signal component/interference signal component part of the needs of the most favourable detection according to the mass measurement that produces then.
Therefore these and other aspect in, a kind of device of being convenient to handle in the received signal of radio receiver reception and relevant method.Received signal partly is made up of signal component part and at least one interference signal component of needs.Quality of connection is measured determiner so that receive the indication of this received signal at least.This mass measurement determiner forms a mass measurement of received signal at least.And connect interference detector so that receive the indication of this received signal at least and the indication of at least one mass measurement of the received signal determined by this mass measurement determiner.The signal component part that this interference detector detects the needs of received signal also selectively suppresses at least one interference signal component part.
Description of drawings
From the following detailed description of the accompanying drawing that summarizes below, present most preferred embodiment of the present invention, can obtain understanding more completely to the present invention and scope thereof.
Fig. 1 explanation is used for distributing a 4:12 mesh repeated use figure of the available channel of cellular communication system sometimes.
Fig. 2 explanation is similar to a mesh repeated use figure who is shown among Fig. 1, but is a 1:3 channel repeated use figure.
Fig. 3 illustrates the frame structure of the example of a pulse train, and the bit that transmits between the dispatching station of communication system and receiving station is formatted as this pulse train.
Fig. 4 explanation has the functional-block diagram of the model of communication system of a communication channel, and receiving station receives co-channel interference signal component and the signal component that needs on communication channel.
Fig. 5 illustrates the functional-block diagram of the device of the embodiment of the invention, and this device forms the part of receiving station shown in Figure 4.
Fig. 6 illustrates the other functional-block diagram of the device of the embodiment of the invention, and this device forms the part of receiving station shown in Figure 4.
The method flow diagram of the method step of Fig. 7 method of the present invention.
Embodiment
At first with reference to figure 1, the channel allocation figure that in the cellular communication system of example, defines with the grid chart explanation of examples of 10 expressions usually.This grid chart with cut line in the mode that spreads all over the reusable channel group in geographic area that this system centers on.
Hexagonal mesh 12 is by radio base station 14 definition.Typically, this hexagonal figure only is used for the mesh planning purpose, and should understand that the covering of the reality that is provided by base station and antenna website typically is not hexagonal.Radio base station 14 forms the part of the cellular network foundation structure of cellular communication system.
In the grid Figure 10 shown in Fig. 1, each radio base station 14 limits three mesh 12.Usually, the portable terminal (not shown) that is positioned at one of mesh 12 sends and receives and from the signal of communication of radio base station 14, radio base station 14 limits the mesh at these portable terminal places.It is favourable utilizing cellular communication system because with the portable terminal continuous communiction be possible, even the continuous mesh of portable terminal by mesh 12.Communication between the radio base station 14 of the continuous mesh that limits mesh 12 " crossing the district switches " allows such continuous communiction, and all do not have a tangible ongoing communication interruption.
Just as previously noted, the major advantage of cellular communication system is owing to can reuse the channel that defines in distributing to the bandwidth of communication system.Channel allocation is not on the same group used at the different mesh of mesh 12.And such channel allocation repeats in continuous group of mesh.Though typically the channel allocation of adjoining cells 12 is different, this channel allocation is in continuous group of repetition of mesh.
The grid Figure 10 that is shown in Fig. 1 is sometimes referred to as " 4:12 " scheme.In such scheme, the channel of distributing to cellular communication system is divided into the group of 12 channels.These groups are indicated with A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2 and D3 in the figure.The group of 12 mesh is such as defining in whole Figure 10 with the group 22 of indicating with runic frame line in the figure.The mesh that the channel of distributing to each mesh of 12 mesh groups is assigned with a different channel group and adjacent position does not distribute same channel.Therefore the interference between signals that produces in the mesh of adjacent position has reduced.
And as previously mentioned, in order to increase the capacity of cellular communication system, these mesh can re-use more normally, have increased the danger of possibility of the interference of the signal of communication that more may occur side by side producing.
Fig. 2 is usually with grid chart 30 expressions, that the other example of other channel allocation figure is described.Figure 30 is sometimes referred to as " 1:3 " scheme.Be similar to arrangement shown in Figure 1, hexagonal mesh 12 is limited by radio base station 14.Each base station 14 limits three mesh 12 to be similar to the mode that this base station 14 limits mesh 12 in the example of Fig. 1.
In the 1:3 scheme, the channel of distributing to the bandwidth of cellular communication system is divided into three groups.In such scheme, the channel of distributing to this communication system is divided into three channel group.These groups are indicated with A, B and C in the figure.Three mesh groups form in whole grid Figure 30 such as the group 42 by the indication of runic frame line.The different allocated channel group of three allocated channel groups of each mesh of group 42 limits.And this channel group is distributed by this way and is made the adjacent mesh of these mesh not distribute same channel-group.
Because the channel that distributes is divided into three channel group rather than 12 channel group, available channel has increased for many times, and the result transmits signal of communication at any specific mesh on available channel.Be that to be increased to four times be possible to message capacity.Yet the spacing between the mesh of reusing same channel group has reduced, and is opposite with the repeated use figure of 4:12 scheme shown in Figure 1.
Therefore because the communication quality that common-channel interference causes reduction degree is bigger care potentially in cellular communication system, this cellular communication system utilizes 1:3 scheme rather than 4:12 scheme.When utilizing the 1:3 communication plan, if the degree that common-channel interference increases interfere with communications significantly, the degree payment that the benefit that the message capacity of then utilizing the 1:3 communication plan to allow increases can be increased by common-channel interference.If in fact important, the degree of common-channel interference may seriously reduce communication quality, gets rid of the possibility of the message capacity that increases the 1:3 allocative decision fully.
The operation of the embodiment of the invention provides a mode, is identified in the co-channel interference signal of receiving station by this mode, so allows better to suppress such interference signal.
The pulse train 50 of Fig. 3 illustrated example, the data bit of form signal of communication in the cellular communication system of example.Pulse train 50 is illustrated in the pulse train of the transmitter installation operating period form of GSM cellular communication system.Other mode that can the form signal of communication can be represented similarly.
Just as shown, pulse train 50 comprises two data fields 52, and each data field 52 is 57 bit long.The training sequence 54 of 26 bit long is placed between two data fields 52.Three bit long afterbodys 56 form in the opposite end of pulse train 50.Tail bits value 56 is null values.The bit that forms data field 52 comprises the source information or the signaling information of voice or other type.Single-bit long denotation 58 between data field 52 and training sequence 54 is information types that expression forms field 52.The consecutive pulses string or from " frame " of form wherein send and receiving station between transmit, such as the radio base station 14 that is shown in Fig. 1 and 2 with between a portable terminal of transmission information, transmit.
Fig. 4 illustrates the communication system of an example, is typically expressed as 70, and expression has the cellular communication system of mesh repeated use plan, such as being represented by the grid Figure 30 that is shown in Fig. 2.In the system 70 that illustrates, need signal transfer station 72 to produce one and transmit signal, on communication channel 74, send receiving station 76 to.Need signal transfer station 72 for example to represent radio base station 14, be shown in Fig. 2, it produces down link signal, is transferred to a portable terminal, here for example by receiving station's 76 expressions.On the contrary, when portable terminal can be operated the transmission uplink signal to radio base station, transfer station 72 can represent a portable terminal.
Additional 78 expression transfer stations of transfer station, it produces interference signal, disturbs the signal that needs by transfer station 72 generations.K shown in this figure interference signal transfer station 78.Each such transfer station 78 transmits interference signal and is received by this receiving station 76 on this communication channel.Such transfer station 78 for example represents radio base station, and it produces signal on same channel, and this transfer station 72 uploads feed signals converting to, and therefore forms co-channel interference signal, and it is disturbed with the signal coherence that needs that is produced by dispatching station 72.
The channel 82 that is transmitted signal by transfer station 72 and station 78 can be by the discrete time channel model simulation that comprises channel impulse response.Such filter is by many taps, in the model that FIR (finite impulse response (FIR)) filter is represented for example.Channel shown in this figure 82 expressions transmit the channel of these signals and such channel with mark h0, h1, hk indication.Respond the path that this signal sends this receiving station 76 to, each channel 82 is different qualities potentially.In general, the channel 82 that transmits respectively by transfer station 72 and 78 signals that produce forms communication channel 74.
Though receiving station's 76 predetermined signals that need that only receive by transfer station 72 generations, in fact the received signal that is received by receiving station 76 is the summation of all signals of transmission on different channel 82.Such summation of representing unlike signals in the figure by sum unit 84.The other distortion that is caused by additive white Gaussian is formed on the other component of the total signal of the received signal that receiving station 76 receives.
Fig. 5 illustrates device 85, forms the part of the receiving station 76 that is shown in Fig. 4 in the embodiment of example of the present invention.This device 85 can be operated identification and be suppressed at one or more interference signal component of the received signal of this receiving station's reception possibly.
Though the describing below of the embodiment of example usually described with respect to communication system, wherein usually wish to suppress the interference signal component part, in one embodiment, wherein the present invention for example is exercisable in cdma communication system, and this received signal comprises at least one and needs signal component part and the many interference signal component parts of possibility.
After carrying out down-conversion operation by the downconverter (not shown), received signal is added to an estimator 86 through circuit 87.Estimator 86 can be operated the channel impulse response that carries out estimation of communication channels, and signal component part and at least one interference signal component part of the needs of received signal transmit on this communication channel.This channel impulse response for example can utilize the other sequencal estimation of a training sequence or this interference signal component part.Estimator 86 produces a signal on circuit 88, this signal is added to interference detector 89.This signal forms a mass measurement of this received signal, for example is the estimation of the signal component part quality of needs after detecting.For the mass measurement that signal component and interference signal component each combination results partly of needs are separated, promptly estimate by estimator 86.Therefore, estimator 86 forms a signal quality determiner, and wherein the signal of Xing Chenging is the indication of the signal component quality that needs after detection.Interference detector 89 is exercisable, selectively suppresses one or more interference signal component of received signal.Noise killer for example may be by a common detector, an interference offset device, a multi-user detector or a subtraction demodulator composition.With respect to embodiment of Fig. 6, wherein noise killer is made up of a common detector below.
The estimator 86 that produces this signal on circuit 88 is exercisable, so that estimate the channel impulse response of channel, transmitting needs signal component and one or more interference signal component part.Utilize the sequencer signal to determine channel impulse response in one embodiment, the sequencer signal allows channel impulse response estimation, such as the training sequence of interference signal component part.
Fig. 6 illustrates device 92, and it forms the part of the receiving station 76 that is shown in Fig. 4 in the embodiment of an example of the present invention.Device 92 is exercisable, so that determine one or more interference signal component part in the received signal of receiving station's reception.By determining it is the component of interference signal component received signal partly, such component can detect with the signal component of needs, therefore is suppressed.
After carrying out down-conversion operation by the downconverter (not shown), this received signal is added to estimator 94 through circuit 96.Estimator 94 is exercisable, so that determine the one or more interference signal components training sequence partly in the received signal of circuit 96 generations.
Estimator 94 comprises a channel estimator 98.Channel estimator is exercisable, so that the signal component of the needs of estimation transmission received signal and the channel of interference signal component.That is to say that channel estimator 98 is exercisable, so that estimate to be shown in this channel 82 of Fig. 4.Channel estimator 98 be equipped with here utilize circuit 102 indication, need install 92 information of the training sequence that needs signal component that form this receiving stations' reception of its part by this.
Yet with the training sequence of this interference signal component part correlation be ignorant.The training sequence group that only can be used for this communication system is known.With the training sequence of an independent interference signal component part correlation be from such group selection.It is exercisable that channel estimator 98 forms its a part of estimator 94, so that the training sequence of extraction and one or more interference signal component part correlation.
Channel estimator 98 estimates that by the channel group of estimating that channel is formed the signal component that needs transmits together with the interference signal component part relevant with each possible training sequence on this estimation channel.
This estimation group for example can partly be estimated by signal component and at least one interference signal component that common estimation needs.But the estimation group can also form by the independent estimation and the interference signal component estimation partly of making up the signal component that needs respectively.
In one embodiment, channel estimating
Figure C9880294400151
Be based on that the least mean-square error that uses following formula to calculate estimates to carry out: h ^ = ( M H M ) - 1 M H r T
Represent Amy's transposition (Hermetian transpose) at this H, and M is the matrix as giving a definition:
M＝[M 0，M 1，...，M k]
At this each Mi is the matrix m that comprises the training sequence of user i i(n), i=0,1..., K, n ∈ [0, N-1], in following mode: M i = m i ( L ) m i ( L - 1 ) … m i ( 0 ) m i ( L + 1 ) m i ( L ) … m i ( 1 ) … … … m i ( N - 1 ) m i ( N - 2 ) … m i ( N - L - 1 ) i = 0 , . . . , K
L is the memory of this channel, promptly for each user, for channel impulse L+1 tap.N is the length of training sequence.
R in addition TIt is the column vector that during training sequence, comprises the length N-L of received signal.Definition above adopting, r TCan be expressed as:
r T＝Mh+w
At this W is noise and the interference that does not detect.
In the same way, received signal can be expressed as during this data sequence:
r D＝Dh+w
At this D is matrix as giving a definition:
D＝[D 0，D 1，...，D K]
Comprise user i, d at this each Di i, the matrix of data sequence (n), i=0,1 ..., K, n? [0, N-1] is defined as follows: D i = d i ( L ) d i ( L - 1 ) … d i ( 0 ) d i ( L + 1 ) d i ( L ) … d i ( 1 ) … … … d i ( R - 1 ) d i ( R - 2 ) … d i ( R - L - 1 ) i = 0 , . . . , K
Residual interference is during training sequence: R T = ( r T - M h ^ ) H ( r T - M h ^ )
For this data sequence be similarly: R D = ( r D - D h ^ ) H ( r D - D h ^ )
The expected value of the residual interference of this training sequence is: E{R T}=...=(N-L-(L+1) (K+1)) σ 2=u σ 2
At this σ 2Be the power of non-detection signal W.
Can similarly carry out for this data sequence: E{R T(the Trace ((M of }=...=(R-L) HM) -1}+1) σ 2=v σ 2
Estimation R^D for the residual interference of this data sequence can be undertaken by making up two top formula. R ^ D = v u R T
Though the training sequence of the signal component that needs is known, must determine the training sequence of interference signal component part.
In order to determine the training sequence of interference signal component part, common channel estimating is carried out in the supposition that partly has specific training sequence according to interference signal component.That is to say, at M=[M 0M 1] and M 1Calculate when adopting all possible training sequence Then for the value of all channel estimation calculation residual interference during data sequence part.Select being estimated as of training sequence of interference signal component part to have the influence that receiver performance is reduced most, this interference signal component part demonstrates minimum residual interference and estimates during data sequence.
Selector 108 is connected to residual interference estimator 106 through circuit 112.Selector 108 partly can operate in case select with at the relevant training sequence of the residual interference value of minimum level with produce the signal on circuit 114 of the such training sequence of expression.The signal of expression channel estimating also produces on circuit 114.
This device 92 also comprises a common detector 118.Connect common detector 118 so that the indication of received training sequence and the channel estimating selected by selector 108, and at least selectively to the circuit 96 that received signal is provided.Common detector 118 is exercisable, so as the signal component that jointly detects needs with known training sequence with one or more relevant interference signal component part of one or more training sequence of selecting by selector 108.Common detector for example may utilize viterbi algorithm to realize in the mode of routine.
Need signal component part and this at least one interference signal component part by jointly detecting, the reduction of the signal component part of the needs that partly caused by interference signal component has reduced basically, and promptly this interference signal component is partly got rid of outside the signal component part of needs.
In the illustrated embodiment, device 92 also comprises individual channel detector 128.And in such an embodiment, channel estimator 98 also is exercisable, so that the signal component that estimation needs, the signal component of the needs of estimating received signal is so that transmit, and all these does not consider any interference signal component part.
Residual interference estimator 106 also is exercisable, also is exercisable so that calculate the residual interference and the selector 108 of such estimation channel, so that select in comprising such individual channel estimation.If determine by selector 108, individual channel is estimated to demonstrate minimum residual interference level, and selector 108 produces a control signal, the position of the switch of its control switch element 136 on circuit 134.
Switch element 136 alternately connection line 96 arrives common detector 118 or individual channel determiner 128.When the residual interference value of individual channel estimation was minimum, selector 108 made switch element 136 be positioned at interconnection line 96 and detector 128.When other channel estimating demonstrated lower residual interference level, selector 108 made the position of the switch of this switch element 136 be positioned at interconnection line 96 and common detector 118.By this way, when suitable, this device jointly or singly detects this received signal.
Fig. 7 illustrates common a kind of method with 200 embodiments of the invention of representing.This method 200 is exercisable, so that the value that changes the relevant training sequence of component definite and received signal.This received signal partly is made up of signal component and at least one interference signal component of needs.
At first with as square frame 202 indication, the indication that responds this received signal produces the channel estimating group.Channel estimating is the estimation of channel, and the received signal component is sent to this receiver on this channel.Then and when the time, produce the residual interference value for each channel estimating group by square frame 204 indication.And as square frame 206 indication, select to demonstrate the channel estimating group of residual interference minimum.The training sequence relevant with this channel estimating is confirmed as the value of this training sequence.
The operation of embodiments of the invention allows to detect the interference signal component part, even does not know the training sequence with such part correlation in advance.The received signal that analysis receives at receiver is at first determined the training sequence with the interference signal component part correlation.And determine this mode, recover the signal component of the needs of received signal by this mode best.Select or recover the signal component of these needs by common detection or the signal component that only detects the needs of received signal.
When the receiver section of the receiver section of the receiving station of cellular communication system part such as portable terminal or radio base station is realized, be convenient to better get rid of common-channel interference.Because common-channel interference can be suppressed preferably, the channel that defines in this system can be reused in more effective mode, such as the 1:3 mesh repeated use figure that is shown in Fig. 2.
Though the embodiment of the present invention and example thereof mainly considers the tdma communication system specialization, can similarly well realize at the access scheme that utilizes other kind such as the communication system of the cdma system of minute time slot, be divided at least two Traffic Channels in this each time slot/frequency, for example at least two users.In this case, the user in this time slot/frequency realizes that by a code interval promptly each user in same time slot/frequency distributes an extended code that the user is specific at interval.In this case, the signal component of Xu Yaoing is easy to be subjected to co-channel and the interior interference of mesh.If for example in a such system, realize embodiments of the invention, should be appreciated that the front has been called the mixing that in fact interference signal component part can be any interference signal component and useful signal, at least for the situation of up link, it is desirable detecting institute important at this.
The description of front is to realize most preferred embodiment of the present invention, and scope of the present invention should not described restriction by this.Scope of the present invention is defined by appending claims.

Claims (18)

1. in can operating the radio receiver that receives a received signal, this received signal partly is made up of signal component part and at least one interference signal component of needs, and a kind of being used to simplified the device that this received signal is handled, and described device comprises:
Connect and be used to receive a mass measurement determiner of the indication of this received signal at least, described mass measurement determiner generates at least one mass measurement of this received signal; With
An interference detector, the indication of at least one mass measurement of this received signal that also connects the indication be used to receive this received signal at least and determine by described mass measurement determiner, what described interference detector detected this received signal needs the signal component part, also selectively detect at least one interference signal component part, so that select to suppress this at least one interference signal component part.
2. according to the device of claim 1, wherein said interference detector is selectively operation also, so that detect needed signal component part, and does not detect this at least one interference signal component part.
3. in can operating the radio receiver that receives a received signal, this received signal is made up of signal component and an interference signal component of needs, from one group of training sequence, select respectively to have needing signal component and having at least one interference signal component part of relative at least the second training sequence of relative first training sequence, at least know first training sequence of a value when this receiver when this receiver receives this received signal, a kind of device that is used for determining this at least the second training sequence value at least, described device comprises:
A channel estimator, connect the indication that is used to receive this received signal that on this receiver, is received at least, described channel estimator is used to generate the channel estimating group, the channel estimating of each group is represented the estimated characteristic of channel, wherein said estimated channel is the estimation that received signal is sent to the channel of receiver thereon, the channel estimating that comprises each group of the estimation that transmits interference signal component channel partly, this interference signal component part is relevant with the training sequence of training sequence group;
A residual interference estimator connects the indication be used to receive the estimation that is formed by described channel estimator, and described residual interference estimator is used to produce the residual interference value of the channel estimating of each group that is formed by described channel estimator; With
A selector, connect the value that is used to receive the residual interference of estimating by described residual interference estimator, described selector is used to select one group of channel estimating by described channel estimator estimated channel estimation group, this channel estimator demonstrates the value of the residual interference of a desired value of being estimated by described residual interference estimator, determines that the training sequence relevant with the channel estimating group of being selected by described selector is the value of this at least the second training sequence.
4. according to the device of claim 3, wherein said channel estimator comprises a lowest mean square error estimator.
5. according to the device of claim 4, the described minimum mean squares estimator that wherein said channel estimator forms, calculate the lowest mean square channel estimation of estimated interference signal, the interference signal of this estimation has each training sequence of this training sequence group, and wherein said calculating is got rid of and this first relevant training sequence of signal component that needs.
6. according to the device of claim 3, wherein comprise the estimation of the signal component channel and the interference signal component local channel of needs by described channel estimator estimated channel estimation group, the interference signal component local channel of channel is estimated, the interference signal component part is relevant with the training sequence of each training sequence of training sequence group on this channel, and wherein said estimation is got rid of and this this relevant training sequence of signal component that needs.
7. according to the device of claim 3, wherein said residual interference estimator calculates the residual interference value of the channel estimating of each group.
8. according to the device of claim 3, wherein said selector is selected one group of channel estimating in the middle of this channel estimating group, and this channel estimating demonstrates the minimum level of residual interference.
9. according to the device of claim 3, also be used to suppress this at least one interference signal component part, described device also comprises:
A noise killer, connect be used to receive this received signal indicate at least and receive with by the indication of this relevant at least the second training sequence of the channel group of described selector selection and the channel estimating that forms by described channel estimator, described noise killer is used for selectively suppressing this at least one interference signal component part.
10. according to the device of claim 9, wherein said noise killer comprises a common detector, described common detector be used for jointly detecting these needs signal component value and have the value of this interference signal component part of second training sequence.
11. according to the device of claim 9, wherein said channel estimator is also estimated the signal component channel of needs, only transmits the signal component channel estimating of the signal component of needs to the needs of the channel of this receiver thereon.
12. according to the device of claim 11, wherein said residual interference estimator also connects and is used to receive the indication that needs signal to estimate channel, described residual interference estimator also is used to produce this needs signal to estimate the value of the residual interference of channel.
13. device according to claim 12, wherein said selector also connects and is used to receive the residual interference value that needs signal estimation channel that is produced by described residual interference estimator, and the relative signal that needs estimates that channel forms the other one group channel estimating group of described selector in central selection.
14. according to the device of claim 13, also be used to detect the value of the signal component of the needs outside this interference signal component, described device also comprises:
The signal detector of needs, connect this that be used to receive this received signal and indicate at least and receive by the selection of the described selector of the signal estimated channel of selecting these needs and indicate, the signal detector of described needs is used to detect the value of the signal component of these needs.
15. according to the device of claim 14, wherein said selector is also operated and is used to select alternately to operate the described common detector and the signal detector of described needs.
16. device according to claim 3, wherein this at least one interference signal component comprises that partly a plurality of interference signal component parts and the channel estimating group that is wherein formed by described channel estimator comprise the estimation of a plurality of channels that transmit a plurality of interference signal component parts thereon.
17. receive the method for a received signal at radio receiver, this received signal is made up of signal component part and at least one interference signal component of needs, this interference signal component partly is made up of at least one interference signal component, the signal component of these needs partly has relative first training sequence, and this at least one interference signal component partly has relative at least the second training sequence, first and second training sequences are selected from one group of training sequence respectively, at least when when this receiver receives this received signal, this receiver is known first training sequence of a value, be used at least determining a kind of improvement of method of the value of this at least the second training sequence, described method comprises step:
Response is in the indication of this received signal of this receiver reception, estimate the channel estimating group, the channel estimating of each group represents to estimate the characteristic of channel, wherein said estimated channel is the estimation that received signal is sent to the channel of receiver thereon, the channel estimating of each group comprises the channel estimating that transmits the interference signal component part thereon, and this interference signal component part is relevant with the training sequence of training sequence group;
Generation is for each the value of residual interference of channel estimating group estimated in described estimating step; With
One group of channel estimating of selective channel estimation group, this channel estimating demonstrates the value of the residual interference that produces during the described step of the residual interference value of described generation desired value, determine that the training sequence relevant with the channel estimating group is the value of this at least the second training sequence.
18. in can operating the radio receiver that receives a received signal, this received signal is made up of with an interference signal component with at least one interference signal component part the signal component of needs, the signal component of these needs has relative first training sequence, and this at least one interference signal component partly has relative at least the second training sequence, this first and second training sequence is selected from one group of training sequence respectively, at least know first training sequence of a value when this receiver when this receiver receives this received signal, be used to estimate the improvement of a device of channel, transmit this received signal to this radio receiver on this channel, described device comprises:
A common detector, selectively connect so that receive the indication at least of this received signal, described common detector is used for jointly detecting signal component at these needs that transmit on the signaling channel of needs together with at least one the interference components part that transmits at least one interference signal channel;
The signal detector of needs selectively connects so that receive the indication at least of this received signal, the described signal component that needs signal detector to be used to detect these needs that transmit on the signaling channel of these needs; With
A selector, be used for selectively being coupled described common detector and the described signal detector that needs are so that this that receives this received signal indicated at least.
CNB988029448A 1997-02-28 1998-02-13 Receiver apparatus, and associated method, for receiving receive signal transmitted upon channel susceptible to interference Expired - Fee Related CN1135717C (en)

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